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The effect of dietary nitrogen on nitrogen partitioning and milk production in grazing dairy cows : A thesis presented in partial fulfilment of the requirements for the Master of Animal Science at Massey University Palmerston North, New Zealand

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Academic year: 2020

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Figure 4: Cow density at district scale. Stars indicate areas where existing dairy farmers are operating under regulated nitrogen limits (modified from Scarsbrook and Melland, 2015)
Figure 5: Transformations of nitrogen in grazed legume based pasture (R; complex organic molecule, N2; nitrogen gas, N2O; nitrous oxide, NO; nitric oxide, NH3; ammonia gas, NH4+; ammonium ion, NO2-; nitrite and NO3-; nitrate)
Figure 6: Digestion and metabolism of nitrogenous compounds in the rumen (McDonald et al.,2011)
Figure 9: Milk yield (kg/day) versus dry matter intake (DMI) (kg/day) with varying dietary crude protein (% CP) and urea (U) (% of CP) in the diet (Polan et al., 1976)
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Outline

Supplementing feed grade urea Nutrient synchrony Other factors influencing nitrogen-use efficiency Dietary nitrogen supply Calculations and statistical analysis Dry matter intake and milk production Discussion Water balance Analytical procedures adapted from (Dairy One, 2014) Additional data for Chapter 2

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